Can someone please tell me the difference between these in plain english? I 
cannot find a clear distinction between them, dispite having reading that 
chapter several times.

Is an EntityManager a PersistenceContext?

"A persistence unit maps a fixed set of classes to a relational database."
This is a quote from the Enterprise Javabeans 3.0 book. 

So what's the difference between a PersistenceUnit and a PersistenceContext?

I'm particularly interesting in learning when I would use different 
configurations of these and when to use a particular configuration For example, 
would I have one EntityManager with two PersistenceContexts because I need to 
manage my entity objects across two databases?

Thanks for any help, Michael.



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